public static void IfNotDate([CanBeNull] DateTime?date, string name)
        {
            if (date == null)
            {
                return;
            }

            Fail.IfNotDate(date, Violation.WhenDateTimeIsNotDate(name, date.Value));
        }
        public static DateTime?FailIfNotDate([CanBeNull] this DateTime?date, string name)
        {
            Fail.IfNotDate(date, name);

            return(date);
        }
        public static DateTime FailIfNotDate(this DateTime date, string name)
        {
            Fail.IfNotDate(date, name);

            return(date);
        }